Johann Heinrich Zulauf was born about 1727 in Darmstadt, Hessen, Deutschland. His birth date and place are based on his details from immigration records, the Kulberg Reports, and the 1767 Grimm census.
Note that immediately following this entry, there is a record for another Johann Zulauf. His wife's name is different, and his children do not match the names above, so these appear to be two different men and their families. Here is that second entry, for reference purposes.
Family # 3633
Head of the Household Johann Zulauf
Wife Catharina Zulauf
Child #1 Johann Zulauf, age 15
Child #2 Georg Zulauf, age 14
Child #3 Heinrich Zulauf, age 11
Child #4 Anna Zulauf, age 18
Child #5 Maria Zulauf, age 8
The family traveled from Luebeck, Germany, to Russia on 29 August 1766.
 Ages are not noted for the adults, which created a problem with matching his wife Susanna from the Kulberg Reports with his wife [wives] in Grimm.
By the time of the first census in Grimm, Johann Heinrich Zulauf's wife's name is Anna Katharina, age 39, the same age as he was.
By the time of the 1775 Grimm census, his wife was named Anna Maria and she was 2 years younger than her husband.
His name does not appear in the 1798 census. The Johann Zulauf listed there in family #132 is his son, based on his age.
These mothers and/or stepmothers are mentioned only because it presents a problem when identifying the mother of the children. It seems like their probable mother was Susanna, named as the mother in the Kulberg Reports. This is fine, unless there was a intake error and the wrong name was used, and it should have been Anna or Anna Katharina. Generally, In the Kulberg Reports and 1775 censuses, children were identified as stepchildren or belonging to one mother or the other if the father had been married more than once. That is not the case in the Zulauf census entries. Neither the Kulberg Reports nor the 1775 census mention any possible other mothers for the children.
Head of the Household Heinrich Zulauf, age 39, Lutheran, Schmied from Darmstadt
Wife Anna Katharina Zulauf, age 39
Child #1 Johannes Zulauf, age 19
Child #2 Johann Konrad Zulauf, age 14
Child #3 Anna Eleonora Zulauf, age 12
Child #4 Maria Elisabeth Zulauf, age 8
Child #5 Anna Barbara Zulauf, age 6
Child #6 Anna Maria Zulauf, age 4
By 1775, it appears that Johann [Heinrich] Zulauf had remarried to Anna Maria Zulauf. She appears to be the mother of Johann Martin Zulauf, who was eight years younger than the next older child. This means that first wife Susanna (and/or possibly Anna Katharina) passed away by 1770, her widowed husband remarried by 1771, and he and his second wife had Johann Martin in 1772.
Child #1 Johann Konrad Zulauf, age 22, by first wife
Child #2 Johann Martin Zulauf, age 3, by second wife
Child #3 Maria Elisazabeth Zulauf, age 17, by first wife
Child #4 Anna Barbara Zulauf, age 15, by first wife
Child #5 Anna Maria Zulauf, age 11, by first wife
I did not find Johannes Heinrich Zulauf living in Grimm or Galka in 1798.
There are two Johann Zulaufs in the Kulbert Reports, found on page 238. They were probably related, probably brothers.
Only one appears in the 1767 Grimm census, and in that source he is named Heinrich Zulauf. Although he has a different wife, his children match the first Johann Zulauf in the Kulberg Reports. I presume his full name was Johann Heinrich Zulauf and that he went by Heinrich in 1767. His first wife must have perished on the journey to the Volga, and he remarried.
It is possible that the two men were cousins, not brothers, with the same name: Johann Heinrich Zulauf. Both men may have used their middle name, Heinrich, as their "day to day" name, as was common in German culture of that day, but at various times each man the men were know by their first name only, or by a first and middle name.
In the 1775 Grimm census, both brothers or cousins appear in consecutive order, family #125 and #126.
Family #125 Johann [Heinrich] Zulauf
Family #126 Johann [Heinrich] Zulauf
The problem is that the children of Heinrich Zulauf in the 1767 census are the ones listed with Johann Zulauf in the 1775 census.
The Heinrich Zulauf in the 1775 census has another different wife who is 12 years younger than she is, and a four week old child. None of his children from the Kulberg Reports are living with him. The remaining three children are named as Heinrich's stepsons, meaning they belonged to his wife. His 34-year-old wife was not old enough to have a 23-year-old child, so the children must have belonged to her previous husband, Mr. Schneider.
The children found in family #49 of the 1767 Grimm census with father Heinrich Zulauf are listed in the 1775 Grimm census as belonging to Johann Zulauf and his wife Anna Maria.
These are the only Zulaufs listed in the Kulberg Reports, and both ended up in Grimm. There are no Zulaufs in The Immigration of German Colonists to Denmark and Their Subsequent Emigration to Russia in the Years 1759-1766
nor in Deutsche Kolonisten auf dem Weg von St. Petersburg nach Saratow, Transportlisten von 1766-1767.
Could both of the men have had the same name? If so, was it possible that they went back and forth regarding which name they used, Johann or Heinrich?
Neither man is listed in the 1798 Grimm census, when they would have been 69 and 71 years old. Only Johannes Zulauf, the son that appears in the 1767 Grimm census, is listed, and next to his name is a notation that he and his family now lived in Galka. The only family member I could find living in Galka was his sister Maria Elisabeth Zulauf who was married to Georg David Schanzenbach and living in household Gk41 with their seven children.
Pleve, Igor. List of Colonists to Russia in 1766, "Reports by Ivan Kulberg," Ministry of Education and Science of Russian Federation, Saratov State Technical University; Published in Saratov, Russia 2010; page 238, Johann Zulauf, document number 3632.
Pleve, Igor. Einwanderung in das Wolgagebiet 1764-1767, Band 2, Herausgegeben von Alfred Eisfeld under Mitarbeit von Sabine Eichwald, Published by the Nordost-Instsitut - 38085 Göttingen, 2005; page 79, family #49, Heinrich Zulauf, age 39, Lutheran Schmied from Darmstadt, and family.
↑ 3.03.1The 1775 and 1798 Census of the German Colony on the Volga, Lesnoy Karamysh, also known as Grimm; Published by the American Historical Society of Germans from Russia, Lincoln, Nebraska, USA; Published date: 1995; family #126 in the 1775 Grimm census, Johann Zulauf family.
↑ 4.04.1The 1775 and 1798 Census of the German Colony on the Volga, Lesnoy Karamysh, also known as Grimm; Published by the American Historical Society of Germans from Russia, Lincoln, Nebraska, USA; Published date: 1995; family #132, Johannes Zulauf family.
Mai, Brent Alan; 1798 Census of the German Colonies along the Volga, Volumes 1 & 2; American Historical Society of Germans from Russia, Lincoln, Nebraska; Published 1999 and 2005.
Eichhorn, Alexander, Dr., and Dr. Jacob and Mary Eichhorn. The Immigration of German Colonists to Denmark and Their Subsequent Emigration to Russia in the Years 1759-1766, Druck and Bindung: Druckerei and Verlap Steinmeier GmbH & Co. KG, 86738, Deiningen, Germany; Published 2012.
Rauschenbach, Georg. Deutsche Kolonisten auf dem Weg von St. Petersburg nach Saratow, Transportlisten von 1766-1767, Published in Moscow, Russia, 2017.